By H. De Haan

Inspite of the numerous guides that have seemed of overdue years at the heredity within the pea, yet the various hereditary ameliorations were analysed, whereas the examine at the localization of the criteria continues to be in its preliminary level. So the pea of which such a lot of varieties take place, in the interim provides lots of fabric to begin a learn. i've got set myself the duty of constructing the completest attainable research of the flower color ameliorations and of the diversities in size of stem. As regards the flower color I construct at the researches of H. TEDIN, who was once type sufficient to spare me his varieties for my examine. In a fashion it's a chuffed accident that the variety of flower shades of the pea is quite small, which renders the study surveyable. Of the identified varieties I now own a pretty whole assortment, pains being continuously taken to complement the gathering. The study at the heredity of the size of stem continues to be in its preliminary degree. So giant a few kinds exist that i've got extra fabric at my disposal than will be labored up. The researches have been made within the Genetic Institute of the nation collage of Groningen.

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Extra resources for Contributions to the Genetics of PISUM

Sample text

Neither have any cases based upon plastid inheritance been described in the literature that appeared after CHITTENDEN'S publication. CAYLEY (10, 1928, p. 529) indeed, communicated that the flames of 'broken' tulips can be transmitted by inoculation. In how far reciprocal crosses are different, I do ilOt know. The only case that might possibly supply arguments in support of plastid-inheritance is the patched pea, because it has appeared that the mosaic character of the flowers is not inherited with the father.

8) occurs as a new form. The F2 corresponds to a 9 : 3 : 3 : 1 segregation, 2 purple patched plants occurring. From 2 purple patched F 2 plants from the cross purple patched X rose an F3 was cultivated (tables 24 and 25). The progeny of one of these plants occurs in the table 24. The branches 10, 11 and 12 were purple; their progeny segregated into purple, rose, purple dotted and rose dotted, while that of the remaining branches segregated into 3 (purple dotted + purple patched) : 1 (rose dotted + rose patched).

Cases in which both allelomorphs for (purple dotted + purple patched) mutated to the factor for purple, therefore, are not known. Rep~tedly a plant was first described as purple, while it appeared later, that purple patched lateral branches occurred on it. On further examination it appeared that the lower internodes had a patched leaf axil. In such cases mutation had occurred in a young stage of the main stem. § 5. The purple plants from the progeny of purple patched From Dr. MANSHOLT I also received the seed of a purple-flowering plant, observed in the progeny of purple patched.

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